Vehicle jack



S; J. VESELY VEHICLE JA K Nov. 17, 1925-.

Filed Jan; 25. 1924 Patented Nov. 17, 1925.

UNITED STATES PATENT OFFICE.

VEHICLE JACK.

Application filed. January 25, 1924. Serial No. 688,402.

To all whom it may concern:

Be it known that I, STANLEY J. VEsnLY, a citizen of the United States, residing at Cedar Rapids, in the county of Linn and State of Iowa, have invented certain new and useful Improvements in Vehicle Jacks, of which the. following is a specification.

This invention relates to lifting jacks, more particularly those used for lifting motor vehicles off their wheel-supports. The type of jack herein is that shown and described in my former application, No. 681,487, filed Dec. 17, 1928, and the object of this invention is to improve the hand.- lever connections with the toggle arms of said jack, and the mechanism which looks the jacks at its terminal and intermediate points of elevation. 1

The nature of the invention is fully disclosed in the description and claims following, reference being had to the accompanying drawing, in which Fig. 1 is a side elevation of a jack embodying my improvements. Fig. 2 is a plan view of the same below the section line 22 of Fig. 1.

In the drawing, the numeral 5 denotes a rear wheel of a motor vehicle, and 6 a part of a rear spring of the same, shown conventionally. The jack is shown applied, as is common, to the spring, for lifting one wheel off the ground. The jack may be briefly described as composed of a base 7 a tubular standard 8 rising therefrom; a post 9 mounted slidably in the standard, and toggle-levers 10 and 11 pivoted to each other and to the standard and post, respectively. Drawing down the lower ends of the levers 10 forces the post upwardly, as will be evident. The mechanism for so operating the toggle-levers will now be described.

The lower ends of the long levers 10 are linked to the base by pairs of shorter toggles 12. The joints of the short toggles are connected by links 13 to a hand-lever 14, con-.

nected by a fulcrum link 15 with the base. Preferably the lever 14: connects pivotally with a collar 16 slidable on the standard, the links 13 connecting with the same collar.

To the collar is pivoted a pawl 17 adapted to engage notches 18 in the standard.

It is evident that the jack would operate in the same way if the hand-lever made connection with but one lever 10, but for the sake of strength and the avoidance of side'- strain, the double connection as shown is preferred.

By reference to the full and dotted outline in Fig. 1 it will be evident that the ack is about equally powerful throughout the extent of its movement. In the initial (dotted) position, the loss of power due to the flattening of the main toggle, is compensated for by the position of the pulling toggle 12, which is at its position of maximum efficiency. As the lifting post rises,

the power of the main toggle increases, as does that of the hand-lever in its relation to the links 13, while the power of the small toggle diminishes somewhat. The operator thus exerts about the same pressure throughout the whole movement of the jack.

It is to be noted that in the extreme position shown in the full outline of Fig. 1, the jack is locked. the weight of the hand lever and the nearly aligned position of the links 18 being sutlicient to hold the jack and its load in the elevated position. The pawl is needed therefore only for intermediate positions. For most operations the pawl may be dispensed with, by simply turning it out of engagement with the notches, and the operator will then 1n all cases throw the jack to the extreme position, and lock it automatically. This effects a saving of time and trouble, since the jack in practice lifts a heavy load with great ease, and a single sweep of the hand-lever lifts the load to final position in a moment.

Having thus described my invention, I claim: 4

1. In a lifting jack, the combination of a base, a tubular standard rising therefrom, a post slidable in said standard, toggle levers connecting the standard and post, and an auxiliary toggle connecting said toggle levers with the base, a collar slidable on the standard, a link connecting the collar with the auxiliary toggle, a hand-lever connecting with the collar, and a link connecting the lever with the base.

2. In a lifting jack the combination of a base, a standard rising thereli'roni a post slidable in said standard a main toggle connecting the post and standard a secondary toggle connecting the main toggle with the base, a collar slidable 0n the standard, a

tinli connecting the collar with the secondary toggle, 21 hand-lever tnlcrumed to the b215 3, and connecting with the collar, and a pawl carried by the collar to engage with the standard, the same being suitably notched for such engagement.

in testimony whereof I afi iz; my signature.

STANLEY J. VESELY. 

